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All Journal RING Mechanical Engineering Automotive Innovations Journal
Faqih Fadillah
Politeknik Negeri Malang
Automotive Engineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The Effect of Thermostat Condition on Thermal Stability and Combustion Emission Efficiency in an Inline 4-Cylinder Gasoline Engine Agus Dwi Putra; Rangga Ega Santoso; Yayi Febdia Pradani; Diama Rizky Septiawan; Faqih Fadillah; Nicko Nur Rakhmaddian
RING ME Vol 6 No 1 (2026): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rme.v6i1.25320

Abstract

This study investigates the effect of thermostat conditions on thermal stability and exhaust emission efficiency in a 1,300 cc inline 4-cylinder gasoline engine. The novelty of this research lies in the integrated evaluation of thermostat removal and thermostat failure on both engine temperature stability and combustion emissions under identical operating conditions. A quantitative experimental method was applied using three thermostat conditions: normal thermostat, without thermostat, and clogged/damaged thermostat. Cooling system temperature and exhaust emissions (CO, HC, and CO₂) were measured at idle speed (800–1000 rpm) for 10 minutes with 2-minute intervals. The data were analyzed using descriptive comparative statistical analysis. The results show that the normal thermostat maintained the most stable operating temperature, reaching 95.8°C at the 8th minute. In contrast, the engine without a thermostat experienced unstable temperature increases and reached 93.4°C at the 10th minute, while the clogged thermostat condition produced the highest temperature of 96.6°C, indicating overheating potential. Removing the thermostat increased CO emissions from 0.01% to 0.04% and HC emissions from 31.7 ppm to 52.3 ppm. These findings confirm that thermostat condition significantly affects engine thermal stability and combustion efficiency; therefore, thermostat removal is not recommended.
Analisis Retak Pada Blade Impeller Dengan Pendekatan Static Structure Danang Priyasudana; Faqih Fadillah
Automotive Innovations Journal Vol. 1 No. 2 (2025)
Publisher : Department of Automotive Engineering Technolgy

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Abstract

Impeller merupakan komponen pompa yang memiliki peran yang sangat penting pada pompa. Desain impeller yang efisien sangat penting dan berguna untuk merancang suatu pompa . Banyak faktor yang berpengaruh terhadap desain impeler seperti sudut masuk dan sudut keluar impeler serta desain dan jumlah blade dari impeller, jika didesain dan diteliti secara eksperimental akan membutuhkan waktu yang lama dan biaya yang mahal. Oleh karena itu perlu, dilakukan simulasi untuk mengetahui kekuatan material blade impeller menggunakan ANSYS dengan pendekatan static structure, meliputi stress analysis, total deformation, dan stress intensity factor (SIF) pada blade impeller yang berbahan aluminium untuk manganalisis retak tang terjadi.Hasil simulasi menunjukkan Stress Analysis menggunakan pendekatan Von Misses menunjukkan tegangan maksimum sebesar 59661 MPa dan tegangan minimum sebesar 30.913 MPa. Selanjutnya total deformation pada blade impeller menunjukkan bahwa nilai maksimum sebesar 16.287 MPa dan minimum sebesar 0 MPa. Lokasi nilai maksimum merupakan daerah dengan potensi mengalami patah atau retak paling tinggi. Dan untuk Stress Intensity Factor (SIF) maksimum Mode II sebesar dan Mode III sebesar .
Co-Authors Danang Priyasudana Diama Rizky Septiawan Nicko Nur Rakhmaddian Putra, Agus Dwi Rangga Ega Santoso Yayi Febdia Pradani